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Related Experiment Videos

A Mathematical Model for Crater Defect Formation in a Drying Paint Layer.

Evans1, Schwartz, Roy

  • 1Department of Mechanical Engineering, University of Delaware, Newark, Delaware, 19716

Journal of Colloid and Interface Science
|June 22, 2000
PubMed
Summary

This study models crater formation in drying paints, finding that drying rate and viscosity changes significantly impact crater size and depth. Reduced viscosity increase and surfactant diffusion lessen cratering severity.

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Coarsening of a class of driven striped structures

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2001

Area of Science:

  • Fluid dynamics
  • Materials science
  • Surface chemistry

Background:

  • Craters in dry coatings are attributed to surface tension gradients.
  • Understanding crater formation is crucial for industrial coating applications.

Purpose of the Study:

  • To develop a mathematical model for surface-tension-gradient-driven flow in thin coating layers.
  • To investigate mechanisms of crater formation, including initial surfactant release and steady surfactant sources.

Main Methods:

  • Utilized lubrication approximation for thin layers.
  • Developed an axisymmetric numerical simulation model.
  • Examined effects of drying rate, surfactant diffusivity, and viscosity changes.

Main Results:

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  • The model accurately reproduces craters with rims and central peaks.
  • Drying rate significantly influences crater diameter and depth.
  • Reduced viscosity increase and surfactant diffusion decrease crater severity.

Conclusions:

  • The model offers insights into industrial coating cratering.
  • Drying dynamics and surfactant behavior are key factors in crater formation.
  • Simplified models can approximate full model results for efficiency.